Self-locking nut

Abstract

The utility model discloses a self-locking nut, which relates to the technical field of locking pieces, and comprises a nut main body, an outer sleeve and a self-locking structure, the nut main body comprises a first nut sub-body and a second nut sub-body, the first nut sub-body and the second nut sub-body can be spliced to form the nut main body, the first nut sub-body is provided with a first part thread groove, and the second nut sub-body is provided with a second part thread groove. The first nut split body is provided with a first part thread groove, the second nut split body is provided with a second part thread groove, the first part thread groove and the second part thread groove form a thread hole of the nut main body when the first nut split body and the second nut split body are spliced, and the outer sleeve can be detachably and fixedly arranged outside the first nut split body and the second nut split body in a sleeving mode; the self-locking structure is arranged on the nut body and can allow a screw to be screwed into the nut body and prevent the screw from being screwed out of the nut body. The self-locking nut is convenient to mount and dismount, and the service life of the self-locking nut can be effectively prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of locking pieces, in particular to a self-locking nut. Background Art

[0002] Mechanical equipment often needs to be disassembled and assembled. Self-locking nuts are used in all fields. Compared with ordinary nuts, they are more widely used and have higher safety and vibration resistance and loosening resistance. In traditional self-locking nuts, in high temperature environments, the nylon melts, causing the nut to fail to self-lock. In extremely high temperatures, thermal expansion can cause thread deformation or diffusion welding, which can lock the nut and the screw and make it difficult to remove. In extremely cold environments, water vapor easily condenses into ice, causing the nut to get stuck, making it difficult or laborious to remove. Traditional self-locking nuts can only be installed by gradually rotating them into place from the bottom of the screw, which not only leads to a slower installation speed, but also causes more friction and wear between the nut and the screw, thereby reducing the life of the nut and the screw. Utility Model Content

[0003] The purpose of the utility model is to provide a self-locking nut to solve the problems existing in the above-mentioned prior art, to facilitate installation and disassembly, and to effectively prolong the service life.

[0004] To achieve the above purpose, the utility model provides the following solutions:

[0005] The utility model provides a self-locking nut, including a nut body, an outer sleeve and a self-locking structure, the nut body includes a first nut split and a second nut split, the first nut split and the second nut split can be assembled to form the nut body, the first nut split has a first part of the thread groove, the second nut split has a second part of the thread groove, the first part of the thread groove and the second part of the thread groove form a threaded hole of the nut body when the first nut split and the second nut split are assembled, the outer sleeve can be detachably fixedly sleeved on the outside of the first nut split and the second nut split; the self-locking structure is arranged on the nut body, and the self-locking structure can allow a screw to be screwed into the nut body and prevent the screw from being screwed out of the nut body.

[0006] Preferably, the self-locking structure includes a retaining body, a spiral mounting groove is provided on the inner surface of the threaded hole, and the spiral direction of the spiral mounting groove is the same as the thread direction of the threaded hole; the retaining body is used to be fixed in the spiral mounting groove, and a plurality of locking bodies are fixedly arranged on the retaining body, each of the locking bodies is inclined in the same direction as the screw is screwed into the nut body, and an end of each locking body close to the screw can cut into the external thread of the screw when the screw has a tendency to be screwed out of the nut body.

[0007] Preferably, one end of each locking body away from the screw contacts the inner wall of the spiral mounting groove, and the distance between one end of each locking body away from the screw and one end of each locking body close to the screw is greater than the depth of the spiral mounting groove, so that one end of each locking body close to the screw can extend out of the spiral mounting groove, and one end of each locking body close to the screw has a transition surface.

[0008] Preferably, the locking body is a dovetail blade, which has a large head end and a small head end, the end face of the large head end of the dovetail blade contacts the inner wall of the spiral mounting groove, and the small head end of the dovetail blade has a transition surface, which is a sloped transition surface. The small head end of the dovetail blade can cut into the external thread of the screw when the screw has a tendency to screw out of the nut body.

[0009] Preferably, the locking body is a rectangular blade, and an end of the rectangular blade close to the screw has a transition surface, and the transition surface is an arc transition surface.

[0010] Preferably, the retaining body is a nylon retaining body, and an injection molding hole is provided on the locking body.

[0011] Preferably, a plurality of first splicing protrusions and a plurality of first splicing grooves are alternately arranged on the splicing surface of the first nut split body, and a plurality of second splicing protrusions and a plurality of second splicing grooves are alternately arranged on the splicing surface of the second nut split body. When the first nut split body and the second nut split body are spliced ​​together, each of the first splicing protrusions is embedded in each of the second splicing grooves, and each of the second splicing protrusions is embedded in each of the first splicing grooves.

[0012] Preferably, it also includes a first clamping member and a second clamping member, a first clamping groove is opened at one end of the nut body, and a second clamping groove is opened at the other end, the outer sleeve is sleeved between the first clamping groove and the second clamping groove on the nut body, the first clamping member is clamped in the first clamping groove, and the first clamping member can contact with one end surface of the outer sleeve, the second clamping member is clamped in the second clamping groove, and the second clamping member can contact with the other end surface of the outer sleeve.

[0013] Preferably, a limiting groove is provided on the outer surface of the nut body; the outer sleeve is formed by winding an extension sheet around the outer surface of the nut body, and the inner surface of the outer sleeve has a connecting protrusion, which can be embedded and fixed in the limiting groove.

[0014] Preferably, the cross section of the outer sleeve is a hexagonal ring; the outer sleeve is formed by stacking a plurality of outer sleeve ring sheets.

[0015] Compared with the prior art, the utility model has achieved the following technical effects:

[0016] The self-locking nut provided by the utility model comprises a nut body comprising a first nut body and a second nut body. The first nut body and the second nut body can be assembled together to form the nut body. The outer sleeve can be detachably fixedly sleeved on the outside of the first nut body and the second nut body to maintain the assembled state of the first nut body and the second nut body, which is convenient for installation and disassembly and can effectively extend the service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 A schematic diagram of a first nut split body in the self-locking nut provided by the utility model;

[0019] Figure 2 A schematic diagram of the initial nut middle oblique splitting in the self-locking nut provided by the utility model;

[0020] Figure 3 A schematic diagram of the initial nut middle positive splitting in the self-locking nut provided by the utility model;

[0021] Figure 4 A schematic diagram of the installation of the first clamping member and the first clamping groove in the self-locking nut provided by the utility model;

[0022] Figure 5 for Figure 4 Schematic diagram of the middle outer sleeve being formed by stacking a number of outer sleeve ring sheets;

[0023] Figure 6 A schematic diagram of the structure of the retaining body in the self-locking nut provided by the utility model (dovetail blade);

[0024] Figure 7 for Figure 6 Schematic diagram of the installation of the retaining body;

[0025] Figure 8 for Figure 6 A schematic diagram of another direction of the holding body;

[0026] Fig. 9 A schematic diagram of the structure of the retaining body in the self-locking nut provided by the utility model (rectangular blade);

[0027] Fig.10A schematic diagram showing that the outer sleeve in the self-locking nut provided by the utility model is formed by winding an extended sheet;

[0028] In the figure: 1-first nut split, 2-second nut split, 3-outer sleeve, 4-spiral mounting groove, 5-retaining body, 6-locking body, 7-transition surface, 8-injection hole, 9-first splicing protrusion, 10-first splicing groove, 11-first clamping groove, 12-first clamping piece, 13-outer sleeve ring. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0030] The purpose of the utility model is to provide a self-locking nut to solve the problems existing in the above-mentioned prior art, to facilitate installation and disassembly, and to effectively prolong the service life.

[0031] In order to make the above-mentioned purposes, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0032] like Figure 1-Figure 10 As shown, the utility model provides a self-locking nut, including a nut body, an outer sleeve 3 and a self-locking structure, the nut body includes a first nut body 1 and a second nut body 2, the first nut body 1 and the second nut body 2 can be assembled to form the nut body, the first nut body 1 has a first part of the thread groove, the second nut body 2 has a second part of the thread groove, the first part of the thread groove and the second part of the thread groove form a threaded hole of the nut body when the first nut body 1 and the second nut body 2 are assembled, the outer sleeve 3 can be detachably fixedly sleeved on the outside of the first nut body 1 and the second nut body 2; the self-locking structure is arranged on the nut body, and the self-locking structure can allow the screw to be screwed into the nut body and prevent the screw from being screwed out of the nut body.

[0033] The self-locking nut provided by the utility model comprises a nut body including a first nut split body 1 and a second nut split body 2. The first nut split body 1 and the second nut split body 2 can be assembled to form a nut body. An outer sleeve 3 can be detachably fixedly sleeved on the outside of the first nut split body 1 and the second nut split body 2 to maintain the assembled state of the first nut split body 1 and the second nut split body 2, which is convenient for installation and disassembly and can effectively extend the service life. Specifically, when the self-locking nut provided by the utility model is disassembled, the outer sleeve 3 is first removed. After the outer sleeve 3 is removed, the nut body will be split from the assembled position to separate the first nut split body 1 and the second nut split body 2. The nut is split 2, so that the nut can be quickly disassembled, which can greatly reduce the time of removing the nut, improve work efficiency, and be efficient and convenient; when installing the self-locking nut provided by the utility model, the first nut split 1 and the second nut split 2 can be directly assembled on both sides of the screw to form the nut body, and there is no need to gradually rotate the screw into place from the bottom, which effectively improves the installation speed, has high durability and wear resistance, reduces invalid friction when positively pressing or reversely screwing out the thread, and only needs to be installed or removed at the position to be pressed, reducing the friction and wear between the nut and the screw, which can effectively extend the service life. The self-locking nut provided by the utility model has a self-locking function, which can avoid loosening under long-term vibration and impact, thereby effectively preventing the safety hazards caused by the loosening of the fastener, and significantly improving the anti-loosening performance and shockproof function of the nut. By changing the structure of the nut, quick disassembly, quick installation and self-locking are combined in one, thus realizing the multifunctionality of the nut, significantly reducing the production cost of the unit product and the time cost when removing the nut. Since the self-locking nut provided by the utility model has a self-locking function, the maintenance cost can be reduced. The traditional nut needs to be checked and tightened regularly to ensure that there is no Loosening or falling off, but after adopting the self-locking nut provided by the utility model, engineers can reduce the working time of daily inspection, thereby reducing maintenance costs and saving time. The self-locking nut provided by the utility model has a self-locking function, and its strength is high, and it can withstand large tension and pressure, and is suitable for high-load application scenarios. The self-locking method of the self-locking nut provided by the utility model will damage the screw, but the nut body is intact and can be reinstalled after disassembly, reducing maintenance costs. The self-locking nut provided by the utility model has a quick-release function, which is simple to install and easy to operate, and does not require special tools and skills. The self-locking nut provided by the utility model can be used in all fields. Compared with traditional nuts, it is more widely used and has higher safety and anti-seismic and anti-loosening properties.For example, in the fields of aviation and aerospace, the self-locking nut provided by the utility model can be used in the manufacture and maintenance of high-precision and high-reliability equipment such as aircraft and rockets to ensure the stability and safety of the equipment; in the automotive field and automobile maintenance, the self-locking nut provided by the utility model can be used for operations such as tire replacement, transmission disassembly and maintenance, and even in various competitions, it can enable maintenance station personnel to replace spare parts more quickly; in the field of industrial equipment maintenance, the self-locking nut provided by the utility model can be used for loading, unloading and replacement of various fasteners; in the field of building structures, the self-locking nut provided by the utility model can be applied to fasteners such as various steel structures, pipelines, bridges and flood control projects. In future architectural designs, the self-locking nut provided by the utility model can be used for fastening in modular house buildings; in the medical and other fields, the self-locking nut product made of specific materials provided by the utility model can be used for fixation of human fractures, and because it has a quick-release function, it can reduce the pain of patients during the removal process and the time and effort of medical staff in removing the nut. In the chemical industry, the self-locking nut provided by the utility model can be used to fasten various equipment and pipelines in chemical reaction devices to ensure sealing and stability; in the military field, since the self-locking nut provided by the utility model has a self-locking function, it can be widely used in the assembly and maintenance of various military equipment, and can be more used in heavy equipment such as aircraft, rockets, tanks, armored vehicles and military vehicles that are subject to great impact and vibration; it is more convenient to use in some special environments. For example, in a cold environment, water vapor easily condenses into ice, causing the nut to get stuck. In a high temperature environment, thermal expansion can cause thread deformation or diffusion welding, thereby locking the screw and nut. In a highly corrosive environment, it is necessary to minimize the contact time between the human body and the nut. In the face of these situations, the quick-release function of the self-locking nut provided by the utility model is needed, which is easier to remove, convenient, fast and efficient; in addition, the self-locking nut provided by the utility model can be used in daily maintenance such as car tires, bicycles or automatic vehicle wheels, electrical appliance maintenance, furniture disassembly and assembly, and plumbing facilities maintenance. In short, the self-locking nut provided by the utility model can be applied to disposable or reusable articles in medical, chemical, thermal, automotive, railway, aviation, aerospace, shipbuilding, electronic equipment, molds, military, cold environment and daily life, etc. It has strong applicability and wide application. The self-locking nut provided by the utility model is a nut that can be self-locking and quickly disassembled and installed, and can be widely used in all fields. In summary, the self-locking nut provided by the utility model has the advantages of quick disassembly, quick disassembly and quick installation, self-locking integration, wide range of applications, high durability, reduced maintenance costs, multiple options, reusable, easy to install, stronger self-locking effect at high temperature and easy to disassemble, etc. It is a very excellent fastener.In addition, the self-locking nut provided by the utility model has a simple structure, a mature manufacturing process, requires less material and is easy to produce automatically. It can be but not limited to manufacturing large sizes such as M3, M4, M5, M6 and even M100, M300, and has a wide range of sizes.

[0034] In this embodiment, the first nut split 1 and the second nut split 2 can be made as follows: first, the initial nut is made, and then the initial nut is cut into two halves by wire cutting, one half is the first nut split 1, and the other half is the second nut split 2. In order to increase the strength, plasticity, toughness and manufacturing cost of the first nut split 1 and the second nut split 2 as much as possible, while ensuring the sharpness of the thread crest, it is preferred to use stainless steel as the raw material, and then perform quenching and high-temperature tempering treatment on the thread crest. The initial nut is divided into three splitting methods, namely diagonal splitting, middle straight splitting and middle oblique splitting. It should be noted here that the material used to make the initial nut can be the same as the nut material on the market.

[0035] Diagonal splitting: Figure 1 As shown, the initial nut is split at the diagonal part. The advantage of the diagonal split is that the thickness at the diagonal part is larger, so that the strength, bearing capacity, torque and stability of the first nut part 1 and the second nut part 2 can be maintained;

[0036] Middle oblique split: Figure 2 As shown, it refers to splitting at a certain angle at the thinnest part of the initial nut. The middle oblique splitting can effectively change the top of the initial nut from a right-angle thread to an acute-angle thread, which increases the sharpness of the thread in disguise. After such processing, the change in the angle of the thread can make the thread opening of the nut better penetrate into the screw, increasing the self-locking effect of the nut.

[0037] Splitting in the middle: Figure 3 As shown, vertical splitting is performed at the thinnest part of the initial nut. The advantage of splitting in the middle is that the processed thread in the middle is straight, not inclined, which makes it easier to quench and high-temperature temper the thread.

[0038] Furthermore, the self-locking structure includes a retaining body 5, an inner surface of the threaded hole is provided with a spiral mounting groove 4, the spiral direction of the spiral mounting groove 4 is the same as the thread direction of the threaded hole; the retaining body 5 is used to be fixed in the spiral mounting groove 4, and a plurality of locking bodies 6 are fixedly arranged on the retaining body 5, each locking body 6 is inclined in the same direction as the screw is screwed into the nut body, and an end of each locking body 6 close to the screw can cut into the external thread of the screw when the screw has a tendency to be screwed out of the nut body. The self-locking nut provided by the utility model can continue to self-lock the nut and the screw even if the retaining body 5 melts at high temperature, and the self-locking effect is long-lasting. Under extremely high temperatures, thermal expansion of traditional nuts will cause deformation of the threads or diffusion welding, thereby locking the screw and the nut and making it difficult to remove. The self-locking nut provided by the utility model can be quickly removed through the quick release function; in an extremely cold environment, water vapor condenses into ice and expands in volume in the threads, which reduces the matching gap between the threads and causes the nut to get stuck. Even when this physical phenomenon is repeated many times, the gap between the threads may deform and expand. At this time, the traditional nuts become difficult to remove or difficult to remove due to their non-quick-release characteristics, while the self-locking nut provided by the utility model has a quick release function and can be easily removed; the retaining body 5 of the self-locking nut provided by the utility model is installed in the spiral mounting groove 4 inside the nut body. Even in a high-load environment such as sun exposure, corrosive, acidic, and humid, the retaining body 5 will be effectively protected by the nut body and will not fail easily, and the self-locking effect will not be weakened.

[0039] In the first preferred embodiment of the present embodiment, the retaining body 5 is installed in the middle of the nut body, and can be installed on both sides. The screw can be screwed in on one side of the nut body or on the other side of the nut body. Further, the end of each locking body 6 away from the screw contacts the inner side wall of the spiral installation groove 4, and the distance between the end of each locking body 6 away from the screw and the end of each locking body 6 close to the screw is greater than the depth of the spiral installation groove 4, so that the end of each locking body 6 close to the screw can extend outside the spiral installation groove 4, and the end of each locking body 6 close to the screw has a transition surface 7, which has a simple structure and is convenient for each locking body 6 to lock the screw. In the second preferred embodiment of the present embodiment, the locking body 6 is a dovetail blade, which has a large head end and a small head end. The end face of the large head end of the dovetail blade contacts the inner side wall of the spiral installation groove 4, and the small head end of the dovetail blade has a transition surface 7, which is a slope transition surface 7. The small head end of the dovetail blade can cut into the external thread of the screw when the screw has a tendency to be screwed out of the nut body.

[0040] It should be noted that the locking body 6 is not limited to being a dovetail blade, but may also be a V-shaped blade, a U-shaped blade or other shapes with a locking structure.

[0041] The third preferred implementation of this embodiment is that the retaining body 5 is a nylon retaining body, and the locking body 6 is provided with an injection hole 8. Nylon is preferably used for injection molding during injection molding, so as to better straighten and fix the blade and combine nylon with the blade. It should be noted that the retaining body 5 can also be made of other materials, such as polyamide materials, such as PBT, PET, PA6 and PA66, etc. The material of the blade can be but not limited to stainless steel, high-temperature alloy, carbon steel, ceramic, carbon-based composite material, glass, copper, aluminum, magnesium, titanium, carbon fiber and other common materials with high durability. In this embodiment, the blade is made of steel sheet, and the steel sheet is first made. The small head end of the steel sheet is quenched to increase strength and toughness. The small head end is provided with a slope transition surface, so that it is convenient for the screw to be twisted in without being stuck, and then the steel sheet is placed in the mold, preferably nylon is used for injection molding, and finally cooled and shaped. The retaining body 5 can straighten the steel sheet, fix the blade, and prevent the blade from detaching. The principle of achieving self-locking is: when the screw is screwed into the nut body, due to the inclined transition surface set at the small head end, the screw thread and the small head end are in point contact, and the small head end will be squeezed by the screw to expand the inclination degree, and the inner side wall of the spiral mounting groove 4 is squeezed by the large head end. When the screw is screwed out, since the large head end is against the inner side wall of the spiral mounting groove 4, the distance between the end of each locking body 6 away from the screw and the end of each locking body 6 close to the screw is greater than the depth of the spiral mounting groove 4, so at this time, the thread of the screw will be cut by the small head end, and the force applied by the screw to the small head end is transmitted to the nut body by the locking body 6, and the nut body is transmitted to the outer sleeve 3, thus forming self-locking, and the self-locking effect is stronger at high temperature, because during self-locking, although the nylon is softened or melted by the high temperature and loses the locking function, the blade cuts onto the screw, and even at high temperature, the blade and the screw will be melted together into one, and the self-locking effect is not lost due to the melting of the nylon. On the contrary, the self-locking effect is enhanced, and the quick release function is retained, which is easier to remove at high temperature.

[0042] In the fourth preferred implementation of the present embodiment, the locking body 6 is a rectangular blade, and the end of the rectangular blade close to the screw has a transition surface 7, and the transition surface 7 is a circular arc transition surface. Compared with the locking body 6 being a dovetail blade, the rectangular blade is easier to process and has less consumables. Its working principle is the same as that of the dovetail blade. In addition, the transition surface 7 of the rectangular blade is a circular arc transition surface, which makes it easier to screw in the screw and difficult to screw out the screw.

[0043] Further, a plurality of first splicing protrusions 9 and a plurality of first splicing grooves 10 are alternately arranged on the splicing surface of the first nut body 1, and a plurality of second splicing protrusions and a plurality of second splicing grooves are alternately arranged on the splicing surface of the second nut body 2. When the first nut body 1 and the second nut body 2 are spliced ​​together, each first splicing protrusion 9 is embedded in each second splicing groove, and each second splicing protrusion is embedded in each first splicing groove 10. As a more preferred implementation of this embodiment, the cross-sections of the first splicing protrusion 9 and the second splicing protrusion are both rectangular, with a large contact area, which can more effectively prevent the nut body from axial movement, and can also allow the nut body to be radially staggered, thus preparing conditions for self-locking, and can also separate the nut body from the splicing position for quick removal; as an optional implementation of this embodiment, the cross-sections of the first splicing protrusion 9 and the second splicing protrusion can also be trapezoidal, triangular, serrated or arc-shaped.

[0044] Furthermore, the self-locking nut provided by the utility model further includes a first clamping member 12 and a second clamping member, a first clamping slot 11 is provided at one end of the nut body, and a second clamping slot is provided at the other end, an outer sleeve 3 is sleeved between the first clamping slot 11 and the second clamping slot on the nut body, the first clamping member 12 is clamped in the first clamping slot 11, and the first clamping member 12 can contact with one end face of the outer sleeve 3, the second clamping member is clamped in the second clamping slot, and the second clamping member can contact with the other end face of the outer sleeve 3. The outer sleeve 3 is limited by the first clamping member 12 and the second clamping member to prevent the outer sleeve 3 from falling off, thereby preventing the nut body from cracking when installed on the screw.

[0045] In a fifth preferred implementation of the present embodiment, the cross section of the outer sleeve 3 is a hexagonal ring, which can be consistent with the profile of the nut body and save materials.

[0046] In the sixth preferred implementation of this embodiment, the outer sleeve 3 is formed by stacking a number of outer sleeve ring sheets 13, which is easy to install and use.

[0047] The seventh preferred implementation mode of this example is that a limiting groove is provided on the outer side of the nut body; the outer sleeve 3 is formed by winding an extension sheet around the outer side of the nut body, and the inner side of the outer sleeve 3 has a connecting protrusion, which can be embedded and fixed in the limiting groove, and can be but not limited to using a stamping method to press part of the structure on the side of the outer sleeve 3 from the outside to the inside into the limiting groove to form a connecting protrusion, and the connecting protrusion is tightened and fixed to the limiting groove. When assembling, the extension sheet is wound around the outer side of the nut body to form the outer sleeve 3, and then the part of the structure on the side of the outer sleeve 3 is pressed into the limiting groove. When disassembling, Use a screwdriver or other sharp object to pry up the outermost extension sheet and remove the extension sheet from the outer side of the nut body, so that the first nut split 1 and the second nut split 2 can be separated and fall off; it should be noted here that there is no specific restriction on the shape of the limiting groove, and any shape can be used. There is no specific restriction on the number of layers or turns of the extension sheet wrapped around the outer side of the nut body, and one or more layers can be used. The extension sheet is made of a material with consistent thickness and good flexibility and tensile resistance. It is preferred to use nickel, nickel-containing, chromium alloy, stainless steel sheet, carbon steel sheet or copper and other materials to cover the first nut split 1 and the second nut split 2 and fit them tightly.

[0048] The present invention uses specific examples to illustrate the principle and implementation of the present invention. The above examples are only used to help understand the method and core idea of ​​the present invention. At the same time, for those skilled in the art, according to the idea of ​​the present invention, there will be changes in the specific implementation and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A self-locking nut, characterized in that: It includes a nut body, an outer sleeve and a self-locking structure. The nut body includes a first nut split and a second nut split. The first nut split and the second nut split can be assembled to form the nut body. The first nut split has a first part of the thread groove, and the second nut split has a second part of the thread groove. The first part of the thread groove and the second part of the thread groove form a threaded hole of the nut body when the first nut split and the second nut split are assembled. The outer sleeve can be detachably fixed on the outside of the first nut split and the second nut split. The self-locking structure is arranged on the nut body, and the self-locking structure can allow the screw to be screwed into the nut body and prevent the screw from being screwed out of the nut body.

2. The self-locking nut according to claim 1, characterized in that: The self-locking structure includes a retaining body, a spiral mounting groove is provided on the inner surface of the threaded hole, and the spiral direction of the spiral mounting groove is the same as the thread direction of the threaded hole; the retaining body is used to be fixed in the spiral mounting groove, and a plurality of locking bodies are fixedly arranged on the retaining body, each of the locking bodies is inclined in the same direction as the screw is screwed into the nut body, and an end of each locking body close to the screw can cut into the external thread of the screw when the screw has a tendency to be screwed out of the nut body.

3. The self-locking nut according to claim 2, characterized in that: One end of each locking body away from the screw contacts the inner wall of the spiral mounting groove, and the distance between one end of each locking body away from the screw and one end of each locking body close to the screw is greater than the depth of the spiral mounting groove, so that the end of each locking body close to the screw can extend out of the spiral mounting groove, and the end of each locking body close to the screw has a transition surface.

4. The self-locking nut according to claim 3, characterized in that: The locking body is a dovetail blade, which has a large head end and a small head end. The end face of the large head end of the dovetail blade contacts the inner side wall of the spiral mounting groove, and the small head end of the dovetail blade has a transition surface, which is a sloped transition surface. The small head end of the dovetail blade can cut into the external thread of the screw when the screw has a tendency to screw out of the nut body.

5. The self-locking nut according to claim 3, characterized in that: The locking body is a rectangular blade, and one end of the rectangular blade close to the screw is provided with a transition surface, and the transition surface is an arc transition surface.

6. The self-locking nut according to claim 2, characterized in that: The retaining body is a nylon retaining body, and an injection hole is provided on the locking body.

7. The self-locking nut according to claim 1, characterized in that: A plurality of first splicing protrusions and a plurality of first splicing grooves are alternately arranged on the splicing surface of the first nut split body, and a plurality of second splicing protrusions and a plurality of second splicing grooves are alternately arranged on the splicing surface of the second nut split body. When the first nut split body and the second nut split body are spliced ​​together, each of the first splicing protrusions is embedded in each of the second splicing grooves, and each of the second splicing protrusions is embedded in each of the first splicing grooves.

8. The self-locking nut according to claim 1, characterized in that: It also includes a first clamping member and a second clamping member. A first clamping groove is provided at one end of the nut body, and a second clamping groove is provided at the other end. The outer sleeve is sleeved between the first clamping groove and the second clamping groove on the nut body. The first clamping member is clamped in the first clamping groove, and the first clamping member can contact with one end surface of the outer sleeve. The second clamping member is clamped in the second clamping groove, and the second clamping member can contact with the other end surface of the outer sleeve.

9. The self-locking nut according to claim 1, characterized in that: A limiting groove is provided on the outer side of the nut body; the outer sleeve is formed by winding an extension sheet around the outer side of the nut body, and a connecting protrusion is provided on the inner side of the outer sleeve, and the connecting protrusion can be embedded and fixed in the limiting groove.

10. The self-locking nut according to claim 1, characterized in that: The cross section of the outer sleeve is a hexagonal ring; the outer sleeve is formed by stacking a plurality of outer sleeve ring sheets.

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